Polonoceras sudeticum
Sugerowana cytacja: Dzik, J. 2015. Polonoceras sudeticum (Renz, 1914) . Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/viewrev/Species/Polonoceras+sudeticum+)
 Polonoceras sudeticum (Renz, 1914) from the P. jugosus (or D. trigonica) Zone at Dzikowiec in the Sudetes. Diagnoza Closed umbilicus of conical appearance demarkated by a spiral ridge; roundly tabulate venter; serial constrictions on conch flanks parallel to the aperture, which bears acute auricles; suture with a deep, narrow flank lobe. Porównanie The constrictions (not internal thickenings!) in the conch, expressed both on nuclei and the conch surface, are so characteristic that there is little doubt that the topotype specimens are conspecific. The acute auricles and deep lobe of the suture point to Polonoceras dorsoplanum as the ancestor of the species. Autekologia Występowanie geograficzne Dzikowiec. Zasięg czasowy P. jugosus (or D. trigonica) Zone. Materiały muzealne ZPAL: 3 specimens. Literatura Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359. |
|
